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ENS 49674
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Category
ENS Notification  and Power Reactor
CFR
10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor +, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident +, 10 CFR 50.73#a2iB +, 10 CFR 50.73#a2vA +  and 10 CFR 50.72#b3v +
Current power
100  +
Current reactor mode
Power Operation +
Description
At 1930 EST on June 7, 2012, it was determ … At 1930 EST on June 7, 2012, it was determined that a series of gaps in a high energy line break (HELB) barrier rendered equipment in the west 480 VAC switchgear room inoperable. There is evidence that this condition had existed since initial construction. The openings were sealed and the equipment restored to operable status at 1605 EST on June 8, 2012. This condition was previously reported to the NRC pursuant to 10 CFR 50.73(a)(2)(i)(B) in LER 2012-001-00. Upon further engineering analysis, it was determined that for limited exposure times safety functions could have been prevented for certain postulated high energy line breaks. Therefore, this condition is also being reported pursuant to 10 CFR 50.73(a)(2)(v)(A),(D), and 10 CFR 50.72(b)(3)(v). The NRC Senior Resident Inspector has been notified.nior Resident Inspector has been notified.  +
Discovered date
20:00:00, 23 December 2013  +
Emergency class
Non Emergency +
Entered date
16:32:00, 23 December 2013  +
Event date
20:00:00, 23 December 2013  +
Event description
At 1930 EST on June 7, 2012, it was determ … At 1930 EST on June 7, 2012, it was determined that a series of gaps in a high energy line break (HELB) barrier rendered equipment in the west 480 VAC switchgear room inoperable. There is evidence that this condition had existed since initial construction. The openings were sealed and the equipment restored to operable status at 1605 EST on June 8, 2012. This condition was previously reported to the NRC pursuant to 10 CFR 50.73(a)(2)(i)(B) in LER 2012-001-00. Upon further engineering analysis, it was determined that for limited exposure times safety functions could have been prevented for certain postulated high energy line breaks. Therefore, this condition is also being reported pursuant to 10 CFR 50.73(a)(2)(v)(A),(D), and 10 CFR 50.72(b)(3)(v). The NRC Senior Resident Inspector has been notified.nior Resident Inspector has been notified.  +
Has query"Has query" is a predefined property that represents meta information (in form of a <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
ENS 49674 +, ENS 49674 +, ENS 49674 +, ENS 49674 +, ENS 49674 +, ENS 49674 +, ENS 49674 +, ENS 49674 +, ENS 49674 +, ENS 49674 +, ENS 49674 +, ENS 49674 +, ENS 49674 +, ENS 49674 +  and ENS 49674 +
Initial power
100  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 23 December 2013  +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
01:52:13, 2 March 2018  +
NRC officer
Charles Teal +
Notification date
16:32:00, 23 December 2013  +
Originated by
Walter Orf +
Reactor critical
true  +
Reactor scram
false  +
Reactor type
CE +
Region
NRC Region 1 +
Reporting criterion
10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor +  and 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident +
Reporting time
-0.145 d (-3.47 hours, -0.0207 weeks, -0.00475 months)  +
Site
Millstone +
Start date
20:00:00, 23 December 2013  +
State
Connecticut +
Title
Historical Gaps in High Energy Line Break Barrier  +
Topic
High Energy Line Break +
URL"URL" is a <a href="/Special:Types/URL" title="Special:Types/URL">type</a> and predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> to represent URI/URL values.
http://www.nrc.gov/reading-rm/doc-collections/event-status/event/2013/20131224en.html#en49674  +
Unit
2  +
 
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